Questions tagged [caching]

A cache is a mechanism for temporarily storing (caching) data locally in order to reduce access time to data stored far away. For CPU/disk/web browsing please use relevant tags (cpu-cache, diskcache,...)

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2834 votes
21 answers
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Ignore files that have already been committed to a Git repository [duplicate]

I have an already initialized Git repository that I added a .gitignore file to. How can I refresh the file index so the files I want ignored get ignored?
trobrock's user avatar
  • 46.9k
2799 votes
7 answers
113k views

Flash CS4 refuses to let go

I have a Flash project, and it has many source files. I have a fairly heavily-used class, call it Jenine. I recently (and, perhaps, callously) relocated Jenine from one namespace to another. I thought ...
Ender's user avatar
  • 27.2k
1894 votes
30 answers
1.3m views

How do we control web page caching, across all browsers?

Our investigations have shown us that not all browsers respect the HTTP cache directives in a uniform manner. For security reasons we do not want certain pages in our application to be cached, ever, ...
Edward Wilde's user avatar
  • 26.2k
1731 votes
35 answers
856k views

Disabling Chrome cache for website development

I am modifying a site's appearance (CSS modifications) but can't see the result on Chrome because of annoying persistent cache. I tried Shift+refresh but it doesn't work. How can I disable the cache ...
tomermes's user avatar
  • 23.2k
1482 votes
17 answers
629k views

Memcached vs. Redis? [closed]

We're using a Ruby web-app with Redis server for caching. Is there a point to test Memcached instead? What will give us better performance? Any pros or cons between Redis and Memcached? Points to ...
Sagiv Ofek's user avatar
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1158 votes
58 answers
583k views

How to force browsers to reload cached CSS and JS files?

I have noticed that some browsers (in particular, Firefox and Opera) are very zealous in using cached copies of .css and .js files, even between browser sessions. This leads to a problem when you ...
1104 votes
25 answers
145k views

Is Safari on iOS 6 caching $.ajax results?

Since the upgrade to iOS 6, we are seeing Safari's web view take the liberty of caching $.ajax calls. This is in the context of a PhoneGap application so it is using the Safari WebView. Our $.ajax ...
user1684978's user avatar
  • 8,589
1091 votes
10 answers
646k views

What is __pycache__?

From what I understand, a cache is an encrypted file of similar files. What do we do with the __pycache__ folder? Is it what we give to people instead of our source code? Is it just my input data? ...
user2063042's user avatar
  • 10.9k
882 votes
10 answers
215k views

What is a "cache-friendly" code?

What is the difference between "cache unfriendly code" and the "cache friendly" code? How can I make sure I write cache-efficient code?
Noah Roth's user avatar
  • 9,130
733 votes
9 answers
534k views

What's the difference between Cache-Control: max-age=0 and no-cache?

The header Cache-Control: max-age=0 implies that the content is considered stale (and must be re-fetched) immediately, which is in effect the same thing as Cache-Control: no-cache.
rubyruy's user avatar
  • 7,822
728 votes
9 answers
829k views

Read whole ASCII file into C++ std::string [duplicate]

I need to read a whole file into memory and place it in a C++ std::string. If I were to read it into a char[], the answer would be very simple: std::ifstream t; int length; t.open("file.txt"); /...
Escualo's user avatar
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711 votes
30 answers
621k views

How can I force clients to refresh JavaScript files?

We are currently working in a private beta and so are still in the process of making fairly rapid changes, although obviously as usage is starting to ramp up, we will be slowing down this process. ...
AdamB's user avatar
  • 8,960
665 votes
18 answers
1.3m views

How to clear gradle cache?

I'm trying to use Android Studio, and the first time I boot it up, it takes like 45 MINUTES to compile... If I don't quit the application, it is okay - each subsequent compilation/running the app will ...
David T.'s user avatar
  • 22.9k
494 votes
6 answers
961k views

Is there a <meta> tag to turn off caching in all browsers? [duplicate]

I read that when you don't have access to the web server's headers you can turn off the cache using: <meta http-equiv="Cache-Control" content="no-store" /> But I also read that this doesn't ...
leeand00's user avatar
  • 25.9k
413 votes
6 answers
609k views

What requests do browsers' "F5" and "Ctrl + F5" refreshes generate?

Is there a standard for what actions F5 and Ctrl+F5 trigger in web browsers? I once did experiment in IE6 and Firefox 2.x. The F5 refresh would trigger a HTTP request sent to the server with an If-...
Morgan Cheng's user avatar
373 votes
8 answers
144k views

ETag vs Header Expires

I've looked around but haven't been able to figure out if I should use both an ETag and an Expires Header or one or the other. What I'm trying to do is make sure that my flash files (and other images ...
GeoffreyF67's user avatar
  • 11.1k
369 votes
23 answers
804k views

Force browser to clear cache

Is there a way I can put some code on my page so when someone visits a site, it clears the browser cache, so they can view the changes? Languages used: ASP.NET, VB.NET, and of course HTML, CSS, and ...
Adam's user avatar
  • 9,389
325 votes
8 answers
288k views

Java time-based map/cache with expiring keys [closed]

Do any of you know of a Java Map or similar standard data store that automatically purges entries after a given timeout? This means aging, where the old expired entries “age-out” automatically. I know ...
Sean Patrick Floyd's user avatar
315 votes
26 answers
513k views

How to clear the cache of nginx?

I use nginx to as the front server, I have modified the CSS files, but nginx is still serving the old ones. I have tried to restart nginx, to no success and I have Googled, but not found a valid way ...
Freewind's user avatar
  • 196k
286 votes
12 answers
104k views

Is Redis just a cache?

I can't see any difference between Redis and caching technologies like Velocity or the Enterprise Library Caching Framework. You're effectively just adding objects to an in-memory data store using a ...
Matt Evans's user avatar
  • 7,333
279 votes
10 answers
474k views

How do you clear Apache Maven's cache?

Recently, Apache Maven seems to be having caching issues. Performing clean installs on our projects using Windows Vista or Windows 7 sometimes produce artifacts with the same data as a previous build ...
MetroidFan2002's user avatar
270 votes
20 answers
229k views

Is there a decorator to simply cache function return values?

Consider the following: @property def name(self): if not hasattr(self, '_name'): # expensive calculation self._name = 1 + 1 return self._name I'm new, but I think the ...
Tobias's user avatar
  • 4,092
268 votes
16 answers
389k views

How to Empty Caches and Clean All Targets Xcode 4 and later

Jonathan suggest here: Xcode Includes .xib files that have been deleted! that cleaning all targets and empty the caches will fix the problem with Xcode including deleted .xib files but I cannot find a ...
Tieme's user avatar
  • 63.9k
260 votes
14 answers
235k views

How to cache data in a MVC application

I have read lots of information about page caching and partial page caching in a MVC application. However, I would like to know how you would cache data. In my scenario I will be using LINQ to ...
Coolcoder's user avatar
  • 4,036
255 votes
16 answers
137k views

Angular IE Caching issue for $http

All the ajax calls that are sent from the IE are cached by Angular and I get a 304 response for all the subsequent calls. Although the request is the same, the response is not going be the same in my ...
Rahul's user avatar
  • 46k
247 votes
14 answers
175k views

Stop jQuery .load response from being cached

I have the following code making a GET request on a URL: $('#searchButton').click(function() { $('#inquiry').load('/portal/?f=searchBilling&pid=' + $('#query').val()); }); But ...
dragonmantank's user avatar
232 votes
6 answers
182k views

Difference between no-cache and must-revalidate for Cache-Control?

From the RFC 2616 http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.9.1 no-cache If the no-cache directive does not specify a field-name, then a cache MUST NOT use the response ...
Luke Puplett's user avatar
  • 43.4k
230 votes
5 answers
212k views

What is the difference between HTTP status code 200 (cache) vs status code 304?

I'm using the Google "Page Speed" plug-in for Firefox to access my web site. Some of the components on my page is indicated as HTTP status: 200 200 (cache) 304 By Google's "Page Speed". What I'm ...
Hank's user avatar
  • 2,341
229 votes
5 answers
131k views

How do cache lines work?

I understand that the processor brings data into the cache via cache lines, which - for instance, on my Atom processor - brings in about 64 bytes at a time, whatever the size of the actual data being ...
Norswap's user avatar
  • 12k
228 votes
5 answers
484k views

How can I clear the SQL Server query cache?

I've got a simple query running against SQL Server 2005 SELECT * FROM Table WHERE Col = 'someval' The first time I execute the query can take > 15 secs. Subsequent executes are back in < 1 ...
PaulB's user avatar
  • 23.9k
221 votes
23 answers
681k views

Clear the cache in JavaScript

How do I clear a browsers cache with JavaScript? We deployed the latest JavaScript code but we are unable to get the latest JavaScript code. Editorial Note: This question is semi-duplicated in the ...
user avatar
215 votes
2 answers
97k views

Redis cache vs. using memory directly

I have not used Redis yet, but I have heard about it and plan to try using it for caching data. I have heard that Redis uses memory as a cache store database. What's the point of Redis, since I can ...
hh54188's user avatar
  • 15.2k
213 votes
12 answers
156k views

AngularJS disable partial caching on dev machine

I have problem with caching partials in AngularJS. In my HTML page I have: <body> <div ng-view></div> <body> where my partials are loaded. When I change HTML code in my ...
Mennion's user avatar
  • 2,883
211 votes
7 answers
163k views

Cache an HTTP 'Get' service response in AngularJS?

I want to be able to create a custom AngularJS service that makes an HTTP 'Get' request when its data object is empty and populates the data object on success. The next time a call is made to this ...
Gavriguy's user avatar
  • 3,068
204 votes
8 answers
143k views

Disable browser cache for entire ASP.NET website

I am looking for a method to disable the browser cache for an entire ASP.NET MVC Website I found the following method: Response.Cache.SetCacheability(System.Web.HttpCacheability.NoCache); Response....
Palani's user avatar
  • 9,002
204 votes
14 answers
256k views

What is the difference between buffer and cache memory in Linux?

To me it's not clear what's the difference between the two Linux memory concepts : buffer and cache. I've read through this post and it seems to me that the difference between them is the expiration ...
James.Xu's user avatar
  • 8,317
203 votes
9 answers
109k views

Programmatically get the cache line size?

All platforms welcome, please specify the platform for your answer. A similar question: How to programmatically get the CPU cache page size in C++?
203 votes
8 answers
305k views

Laravel 5 Clear Views Cache

I notice that Laravel cache views are stored in ~/storage/framework/views. Over time, they get to eat up my space. How do I delete them? Is there any command that could? I tried php artisan cache:...
basagabi's user avatar
  • 4,978
189 votes
3 answers
200k views

Notepad++ cached files location

On the most recent versions of Notepad++, when the application is closed, unsaved files are maintained when the application is restarted. I presume that those files are cached on a temporary files. ...
RedEagle's user avatar
  • 4,468
189 votes
15 answers
176k views

Spring Cache @Cacheable - not working while calling from another method of the same bean

Spring cache is not working when calling cached method from another method of the same bean. Here is an example to explain my problem in clear way. Configuration: <cache:annotation-driven cache-...
Bala's user avatar
  • 4,527
186 votes
26 answers
277k views

How to force Chrome browser to reload .css file while debugging in Visual Studio?

I'm currently editing a .css file inside of Visual Studio 2012 (in debug mode). I'm using Chrome as my browser. When I make changes to my application's .css file inside of Visual Studio and save, ...
duyn9uyen's user avatar
  • 9,939
181 votes
15 answers
76k views

How does one write code that best utilizes the CPU cache to improve performance?

This could sound like a subjective question, but what I am looking for are specific instances, which you could have encountered related to this. How to make code, cache effective/cache friendly (more ...
goldenmean's user avatar
  • 18.7k
180 votes
4 answers
306k views

Clear MySQL query cache without restarting server

Is there any way to clear mysql query cache without restarting mySQL server?
Mahoor13's user avatar
  • 5,517
177 votes
5 answers
295k views

Write-back vs Write-Through caching?

My understanding is that the main difference between the two methods is that in "write-through" method data is written to the main memory through the cache immediately, while in "write-...
triple fault's user avatar
  • 13.8k
175 votes
5 answers
28k views

What is the difference between Caching and Memoization?

I would like to know what the actual difference between caching and memoization is. As I see it, both involve avoiding repeated function calls to get data by storing it. What's the core difference ...
John's user avatar
  • 1,753
175 votes
21 answers
133k views

How would you implement an LRU cache in Java?

Please don't say EHCache or OSCache, etc. Assume for purposes of this question that I want to implement my own using just the SDK (learning by doing). Given that the cache will be used in a ...
Hank Gay's user avatar
  • 71.2k
174 votes
4 answers
146k views

What is Cache-Control: private?

When I visit chesseng.herokuapp.com I get a response header that looks like Cache-Control:private Connection:keep-alive Content-Encoding:gzip Content-Type:text/css Date:Tue, 16 Oct 2012 06:37:53 GMT ...
user782220's user avatar
173 votes
19 answers
221k views

How to clear APC cache entries?

I need to clear all APC cache entries when I deploy a new version of the site. APC.php has a button for clearing all opcode caches, but I don't see buttons for clearing all User Entries, or all System ...
lo_fye's user avatar
  • 6,830
171 votes
15 answers
476k views

How to programmatically empty browser cache?

I am looking for a way to programmatically empty the browser cache. I am doing this because the application caches confidential data and I'd like to remove those when you press "log out". This would ...
Tower's user avatar
  • 101k
168 votes
3 answers
164k views

How do I request a file but not save it with Wget? [closed]

I'm using Wget to make http requests to a fresh web server. I am doing this to warm the MySQL cache. I do not want to save the files after they are served. wget -nv -do-not-save-file $url Can I do ...
T. Brian Jones's user avatar

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